Microled gray scale expansion method

The invention discloses a Microled gray scale expansion method, which is characterized in that a mixed waveform composed of a sawtooth wave and a square wave is used as a driving signal of Microled gray scale expansion, the driving signal is a periodic signal, in each period, the front section of the driving signal is the sawtooth wave, the middle section of the driving signal is the square wave, the rear section of the driving signal is 0, and according to different gray scales of the Microled and different lightening time, when the gray scale Gray of the Microled is less than Gray 0, the sawtooth wave of the front section of the driving signal is used as the driving signal; and when the gray scale Gray of the Microled is greater than Gray 0 and less than Gray 1, the mixed waveform formed by the sawtooth wave and the square wave is taken as the driving signal, and when Gray is greater than Gray 1, the square wave is taken as the driving signal. According to the Microled gray scale expansion method, different driving signals and lightening time are adopted for the Microled at different gray scales, and the brightness of the Microled is adjusted through the combined action of two parameters, namely, the lightening time and the current amplitude, so that the brightness of the Microled at different gray scales is consistent with a gama 2.2 curve, and the display quality of the Microled can be remarkably improved. According to the invention, the lightening time of the Microled is not increased, the design area is not increased, and the technology is easy to realize.